Portable electric-lighting apparatus.



H. H. HIRSGH. PORTABLE ELECTRIC LIGHTING APPARATUS. APPLICATION FILEDHARA, 1913.

Patented Dec. 15,1914,

2 SHEETS-SHEET 1.

WlTNESSES: INVENTOR:

H. H. HIRSGH. PORTABLE ELECTRIC LIGHTING APPARATUS. APPLICATION FILEDHAR,3.1913- Patented Dec. 15, 1914.

2 SHEETS-SHEET 2. 5

WITNESSES: INVENTOR;

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v kuij/mg/ yQ WOLI (W HIRAM HARRY HIRSCH, 0F PHIIrADELPHIA,PENNSYLVANIA.

PQB TABLE ELECTRIC-LIGHTING APPARATUS.

Specification of Letters Patent.

Patented Dec. 15, 1914.

Application filed March 3, 1918. Serial No. 751,836.

To all whom it may concern.

Be it known that I, HIRAM H. HInsoH, a citizen of the United States,residing at Philadelphia, in the State of Pennsylvania, have invented acertain new and useful Improvement in Portable Electric-LightingApparatus, whereof the following is a specification, reference being hadto the accompanying drawings.

My invention relates to apparatus including an incandescent lamp incooperative relation with a storage battery provided with means toattach it to the person of a miner or other operator, and provides asafety casing for the lamp designed to prevent ignition of fire-damp orother explosive gases when said lamp is broken.

As hereinafter described my invention includes a lamp casing andremovable cover provided with a transparent lens or panel, normallyassembled in substantially hermetically sealed relation; said casing.having distinct oppositely olarized elements included in the electriccircuit by which the lamp is energized, so constructed, and arrangedthat they are displaced and separated and thus break the circuit of thelamp, instantly extinguishing the latter, whenever said transparentelement is broken or removed, and whenever said casing is crushed orpunctured.

M invention includes the various novel features of construction andarrangement hereinafter more definitely specified.

In the drawings :Figure I is a vertical sectional view of a lamp casingconveniently embodying my invention and indicating its operativeconnection with a storage battery. Fig. II is a fragmentary front Viewof said casing with the cover removed. Fig. III is a fragmentary frontview of said casing, similar to Fig. II but showing said polarizedelements relatively displaced and separated by crushing the casing. Fig.IV is a f agmentary sectional view similar to Fig. I but showing thecasing elements displaced and the lump circuit broken by removal of thetransparent panel. Fig. V is a vertical sectional view of a lamp easing,similar to Fig. I, but showing a modified form of my invention. Fig. VIis a fragmentary front view of the casing shown in Fig. V, but with thefront cover removed. Fig. VII is a fragmentary sectional view similar toFig.

" V but showing the casin elements displaced and the lamp circuit bro enby crushing the casing local to the spring terminals thereof. Fig. VIIIis a fragmentary sectional view slmilar to Fig. V but showing the casingelements displaced and the lamp circuit broken by crushing the casingremote from said spring terminals. Fig. IX is a fragmentary sectionalview similar to Fig. V but showing the lamp circuit broken bydisplacement of the transparent portions of the casing.

Referring to the form of my invention shown in Figs. I to IV inclusive;the lamp casing includes the outer metallic shell 1 having the screwthread 2 to detachably engage the cover 3, and having the socket ofinsulating material 1 supporting the inner metallic shell 5 providedwith the screw thread 6 to receive the incandescent electric lamp 7;said shell 5 serving as a reflector for said lamp. Said shell 5 makeselectrical contact with the metallic sleeve terminal 8 of said lampwhich has the other metallic terminal 9 in electrical contact with thesocket terminal 10.

Said inner shell 5 is insulated from the outer shell 1 by the annularbands 11 and 12,,

the latter extending between the shoulders 13 and 14 respectively uponsaid inner and outer shells and bracing them inspaced relation; theouter edges of said casing shells 1 and 5 and insulating band 11 forminga seat for the gasket 16 which is preferably of resilient material, sothat the transparent lens or panel 18 is secured in substantiallyhermetical relation with said casing when the latter is assembled asindicated in Fig. I.

As indicated, said outer shell 1 and inner shell 5 are electricallypolarized by suitable connection with the storage battery 19, and saidshell 5 also supports the swing 20 which is electrically connectedtherewith and extends between said outer shell 1 and inner shell 5 andhas its free end projecting through the notch 21 in said inner shell sothat it is normally upheld from the latter by the transparent panel 523,formed of glass or other frangible material.

Said outer shell 1 is corrugated to form a spiral seat 24 for the spring25 which has its outer end secured in the opening 26 in said shell andits inner end normally resting upon said spring 20 in electricalconnection therewith; so that said casingelenients 20 and 25 arerespectively oppositely electrically polarized in connection with saidbattery 19 and included in the circuit by which said lamp 7 isenergized. Said shell 5 is held in said socket 4 and mechanicallyconnected by the screw 27 which is insulated therefrom but electricallyconnected with said spring 10; the insulating material 28 beinginterposed between said shell and spring.

It is to be understood that both the metallic and transparent elementsof said casing are crushable, so that when either portion of said casingis crushed the lamp 7 is extinguished, by displacement of said op o-Referring to' the form of my invention shown in Figs. V toIX-inclusiveythe lamp casing includes the outer metallic shell 31 havingthe screw thread 32 to detachably engage the cover 33 and having thesocket of insulating material 34 supporting the inner metallic shell 35having the screw thread 36 to receive the incandescent electric lamp 37;said shell 35 serving as a refiector for said lamp. Said shell 35 makeselectrical contact with the metallic sleeve terminal 38 of said lampwhich has the other metallic terminal 39 in electrical contact with thesocket terminal 40.

Said inner shell 35 is insulated from the outer shell 31 by the annularbands 41 and 42, the latter extending between the shoulders 43 and 44,respectively upon said inner and outer shells and bracing them in spacedrelation. The outer edges of said casing shells 31 and 35 and saidinsulating band 41 form a seat for the gasket 46 which is preferably ofresilient material, so that the transparent lens or panel 48 is securedin substantially hermetical relation with said casing when the latter isassembled as indicated in Fig. V.

As indicated, said outer shell 31 and inner shell 35 are oppositelyelectrically polarized by suitable connection with the storage battery49, and said shell 35 supports the spring 50 which is electricallyconnected therewith and extends between said outer shell 31 and innershell 35 and has its free end projecting through the notch 51 in saidinner shell so that it is normally upheld from the latter by thetransparent panel 53 formed of glass or other frangible material. Saidshell 35 is held in said socket 34 and mechanically connected by thescrew 54 which is insulate therefrom but electrically connected with thespring 40.

Said outer shell 31 is electrically connected with the spring 55 whichhas its outer end secured in the opening 56 in said shell and its innerend normally resting upon said spring 50 in electrical connectiontherewith so that said casing elements 50and 55 are respectivelyoppositely electrically polarized in connection with said battery 49'and included in the circuit by which said lamp 37 is energized.However, said outer shell 31 is provided with the resilient metal zone57, normally retained therein by the indentation 58, shown in Fig. V,the diametrically opposite portion of said zone 57 serving as a fulcrumfor the free end of said spring terminal 55, whereby the latter may bedisplaced and thus separated from the spring terminal 50 when the casingis subjected to crushing stresses. For instance, as shown in Fig. VIIthe outer shell 31 has been crushed and displaced toward the inner shell35 so as to separate the spring 55 from the spring 50, although thefulcrum 57 of the latter has not been shifted; the crushing efiect beinglocal to said spring contacts.

On the other hand, crushing stresses upon said casing remote from saidspring contacts displace said zone 57 so that the fulcrum portionthereof i displaced outwardly, as indicated in Fig. III, thus separatingsaid spring contacts 50 and 55 and breaking the lamp circuit. Asindicated in Fig. IX the panels 48 and 53 have been crushed anddisplaced so as-to permit said spring 50 to separate from said spring 55and thus break the lamp circuit and extinguish the lamp 37.

I do not desire to limit myself to the precise details of constructionand arrangement herein set'forth, as it is obvious that variousmodifications may be made therein without departing from the essentialfeatures of my invention as defined in the appended claims.

1. An electric lamp casing having outer and inner metallic shells,included in the lamp circuit; means normally maintaining said shells incontact but causing separation thereof when said outer shell is crushed;whereby said circuit is broken when said casing is subjected to stressestending to break the lamp.

2. An electric lamp casing having outer and inner metallic shells, meansnormally maintaining said shells electrically connected but causingseparation thereof when said outer shell is crushed; whereby saidcircuit is broken when said casing is subjected to stresses tending tobreak the lamp.

3. The combination with an electric lamp; of a casing for said lampincluding an inner metallic shell serving as a reflector for said lamp;an outer metallic shell; means whereby said shells are normallyelectrically conmeans distinct from said element and from said shell,movable relatively to said shell when the latter is deformed; wherebywhen said shell is deformed said element is shifted to break the lampcircuit.

In testimony whereof, I have hereunto signed n1 name at Philadelphia,Pennsylvania, this twenty-eighth day of February,

HIRAM HARRY HIRSCH. Witnesses:

Faanors A. Pococx, MICHAEL Manna.

